#include <stdio.h>
int Sum(int s, int e)
{
 int result = 0;
 for(int i = s; i <= e; i++)
 {
 result += i;
 }
 return result;
}
int main()
{
 int start = 1;
 int end = 100;
 printf("I will begin\n");
 int n = Sum(start, end);
 printf("running done, result is: [%d-%d]=%d\n", start, end, n);
 return 0;
}

